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Finding the Fourth Proportional to 851.15, 1,277.40 and 331.40

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Solution

The fourth proportional to 851.15, 1,277.40 and 331.40 is: 497.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    851.15 : 1,277.40 = 331.40 : x
  2. Step 2: Convert to fraction form
    851.15/1,277.40 = 331.40/x
  3. Step 3: Cross multiply
    851.15x = 1,277.40 × 331.40
  4. Step 4: Simplify right side
    851.15x = 423,323.97
  5. Step 5: Solve for x
    x = 423,323.97/851.15
  6. Step 6: Final answer
    x = 497.36

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.